J/AJ/161/215ivo://CDS.VizieR/J/AJ/161/215doi:10.26093/cds/vizier.51610215CDSLeahy D.Buick M.Postma J.Morgan C.2022-03-16T11:52:04Z2021-07-28T07:27:33ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesultraviolet-photometryThe Ultraviolet Imaging Telescope (UVIT) on board the AstroSat observatory has imaged the Andromeda galaxy (M31) from 2017 to 2019 in the far- and near-UV (FUV and NUV) with the high spatial resolution of ~1". The survey covered the large sky area of M31 with a set of observations (Fields), each 28' in diameter. Field 1 was observed in two epochs with the F148W filter, separated by ~1133days (~3.10yr). The 6.4kpc diameter Field 1 (at the distance of M31) includes a substantial part of the inner spiral arms of the galaxy. We identify UVIT sources in both epochs of Field 1 and obtain catalogs of sources that are variable in FUV at >3{sigma} and >5{sigma} confidence level. The fraction of FUV-variable sources is higher for brighter sources, and the fraction is higher in the two main spiral arms compared to other areas. This is evidence that a significant fraction of the FUV variables are associated with hot young stars. Source counterparts are found for 42 of the 86 >5{sigma} FUV variables using existing catalogs. The counterparts include 10 star clusters, 6 HII regions, 5 regular or semiregular variables, 6 other variables, and 6 nova or nova candidates. The UVIT FUV-NUV and FUV-FUV color-magnitude diagrams confirm the association of most of the FUV variables with hot young stars. A catalog of UVIT photometry for the variable sources is presented.2021AJ....161..215Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/215CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+AS/92/625 : Ionized nebulae in M31 (Walterbos+ 1992)J/MNRAS/351/1071 : POINT-AGAPE Survey. M31 variables (An+, 2004)J/A+A/445/423 : WeCAPP Survey. M31 variables (Fliri+, 2006)J/MNRAS/351/1071 : POINT-AGAPE Survey. M31 variables (An+, 2004)J/MNRAS/369/97 : M31 planetary nebulae velocities (Halliday+, 2006)J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)J/AJ/142/139 : A new catalog of HII regions in M31 (Azimlu+, 2011)J/ApJ/759/11 : Wolf-Rayet content of M31 (Neugent+, 2012)J/ApJS/215/9 : PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)J/ApJ/802/127 : PHAT stellar cluster survey. II. AP catalog (Johnson+, 2015)J/ApJ/836/64 : Luminous variable stars in M31 & M33. IV. (Humphreys+, 2017)J/ApJ/844/40 : Variable stars in M31 and M33.V. HR diagram (Humphreys+, 2017)J/AJ/156/241 : First catalog variable stars measured by ATLAS (Heinze+, 2018)J/A+A/630/A92 : The Hubble Catalog of Variables (Bonanos+, 2019)J/ApJS/247/47 : Ultraviolet survey of M31 with UVIT on AstroSat (Leahy+, 2020)J/ApJS/250/23 : AstroSat/UVIT and Chandra X-ray sources in M31 (Leahy+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/215https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/215http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/215https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/215https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/215http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/215GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/161/215/table2 (Photometry for >3{sigma} variable FUV sources measured in UVIT Field 1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/215/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/215/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/215/table2?GETtext/xml+votable180.050000true10.48707541.190926110.005555555555555556Cone search capability for table J/AJ/161/215/table4 (Multiwavelength counterparts of the UVIT FUV>5{sigma} variables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/215/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/215/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/215/table4?GETtext/xml+votable180.050000true10.887841.20290.0055555555555555566/2623 2709https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/161/215?format=asciiUVdefaultJ/AJ/161/215/table2Photometry for >3{sigma} variable FUV sources measured in UVIT Field 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[10.4/11.1] Right Ascension, UVIT (J2000)degpos.eq.ra;meta.mainDEJ2000[41/41.5] Declination, UVIT (J2000)degpos.eq.dec;meta.mainF148W-A[17.86/26.71]? F148W band AB magnitude, Observation Amagphot.mag;em.UV.100-200nmfloatnullablee_F148W-A[0.07/0.84]? Uncertainty in F148W-Amagstat.errorfloatnullableF148W-B[17.69/28.77]? F148W band AB magnitude, Observation Bmagphot.mag;em.UV.100-200nmfloatnullablee_F148W-B[0.07/1.5]? Uncertainty in F148W-Bmagstat.errorfloatnullableF148W-S/N[3/20.8] Signal-to-noise, F148Wstat.snrfloatN279N-A[17.02/25.65]? N279N band AB magnitude, Observation Amagphot.mag;em.UV.200-300nmfloatnullablee_N279N-A[0.04/1.6]? Uncertainty in N279N-Amagstat.errorfloatnullableN219M-A[17.41/26.6]? N219M band AB magnitude, Observation Amagphot.mag;em.UV.200-300nmfloatnullablee_N219M-A[0.04/1.6]? Uncertainty in N219M-Amagstat.errorfloatnullableF172M-B[17.51/25.58]? F172M band AB magnitude, Observation Bmagphot.mag;em.UV.100-200nmfloatnullablee_F172M-B[0.04/0.79]? Uncertainty in F172M-Bmagstat.errorfloatnullableF169M-B[17.81/28.95]? F169M band AB magnitude, Observation Bmagphot.mag;em.UV.100-200nmfloatnullablee_F169M-B[0.03/2.9]? Uncertainty in F169M-Bmagstat.errorfloatnullableJ/AJ/161/215/table4Multiwavelength counterparts of the UVIT FUV>5{sigma} variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSource[1/42] Source number identifiermeta.id;meta.mainintRAJ2000[10.48/11] Right Ascension, UVIT (J2000)degpos.eq.ra;meta.mainDEJ2000[41.14/41.46] Declination, UVIT (J2000)degpos.eq.dec;meta.mainCat1First catalog match (1)meta.id;meta.datasetcharr_Cat1[1/25] Reference for Cat1meta.ref;pos.frameintSep[0.03/1.89] Separation between the UVIT source and the identified match from VizieRarcsecpos.angDistance;src.orbitalfloatRad[0.41/2.56]? radius of cluster from literature for sources that match with a clusterarcsecphys.angSize;srcfloatnullableCat23Second and third catalog matchmeta.id;meta.datasetr_Cat23References used for Cat23meta.ref;pos.framecharDist[0.02/1.53]? Distancearcsecpos.angDistancefloatnullableJ/AJ/161/215/refsReferences used for table4BIBBIBcodemeta.bib.bibcodecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/25] Reference numbermeta.id;meta.mainintAuthorMain author of the referencemeta.bib.authorcharCatCatalog in VizieRmeta.notechar